Larval Symptoms of Corn Rootworm Progressive feeding on the roots causes difficulty for the plant to take up moisture and nutrients A reduced root system can also predispose the corn plant to fall over in wet or windy conditions Often this lodging occurs prior to tasseling, and the plant attempts to grow upright, causing a tangled condition known as "goose-necking" Injured roots are also easy entry points for fungi and bacteria that may increase severity of root and stalk rots and premature death Management Favorable conditions for increase are moist soils at egg laying and mild winters Several natural enemies exist, including nematodes, parasites, predators and diseases, but the population rebuilds rapidly
A starter (also self starter, self, cranking motor, or starter motor) is a device used to rotate (crank) an internal-combustion engine so as to initiate the engine's operation under its own power. Starters can be electric, pneumatic, or hydraulic. In the case of very large engines, the starter can even be another internal-combustion engine. Internal-combustion engines are feedback systems, which, once started, rely on the inertia from each cycle to initiate the next cycle. In a four-stroke engine, the third stroke releases energy from the fuel, powering the fourth (exhaust) stroke and also the first two (intake, compression) strokes of the next cycle, as well as powering the engine's external load. To start the first cycle at the beginning of any particular session, the first two strokes must be powered in some other way than from the engine itself. The starter motor is used for this purpose and is not required once the engine starts running and its feedback loop becomes self-sustaining.
The development of a small scale stone crusher is the actual solution to the disparity between the large scale stone crushing and the manual stone crushing since it will reduce the human effort requirements and increase output. It is more economical to crush stones within a small radius between the crushing point and the construction site where it is going to be used. This saves the construction companies transport costs which they could have incurred. There is widespread demand for sized stone as a result of the increasing technological advancement and need for better infrastructure. The implementation of the design in the target societies in Cameroon will contribute towards alleviation of the Rural-Urban migration since the stone crushing activity is an income generating activity
Hand pumps are manually operated pumps; they use human power and mechanical advantage to move fluids or air from one place to another. They are widely used in every country in the world for a variety of industrial, marine, irrigation and leisure activities. There are many different types of hand pump available, mainly operating on a piston, diaphragm or rotary vane principle with a check valve on the entry and exit ports to the chamber operating in opposing directions. Most hand pumps have plungers or reciprocating pistons, and are positive displacement. Hand pumps are commonly used in developing countries for both community supply and self-supply of water and can be installed on boreholes or hand-dug wells.
Space exploration is the ongoing discovery and exploration of celestial structures in outer space by means of continuously evolving and growing space technology. While the study of space is carried out mainly by astronomers with telescopes, the physical exploration of space is conducted both by unmanned robotic space probes and human spaceflight. While the observation of objects in space, known as astronomy, predates reliable recorded history, it was the development of large and relatively efficient rockets during the mid-twentieth century that allowed physical space exploration to become a reality. Common rationales for exploring space include advancing scientific research, national prestige, uniting different nations, ensuring the future survival of humanity, and developing military and strategic advantages against other countries.
Radio signals exist as a form of electromagnetic wave. These radio signals are the same form of radiation as light, ultra-violet, infra-red, etc., differing only in the wavelength or frequency of the radiation. Electromagnetic waves have two elements. They are made from electric and magnetic components that are inseparable. The planes of the fields are at right angles to each other and to the direction in which the wave is travelling.
Water boils when the molecules are able to overcome the vapor pressure of the surrounding air to move from the liquid phase to the gas phase. A few different processes occur when you add a solute that increases the amount of energy (heat) needed for water to make the transition. When you add salt to water, sodium chloride dissociates into sodium and chlorine ions. These charged particles alter the intermolecular forces between water molecules. In addition to affecting the hydrogen bonding between water molecules, there is an ion-dipole interaction to consider. Every water molecule is a dipole, which means one side (the oxygen side) is more negative and the other side (the hydrogen side) is more positive. The positively-charged sodium ions align with the oxygen side a water molecule, while the negatively charged chlorine ions align with the hydrogen side of a water molecule. The ion-dipole interaction is stronger than the hydrogen bonding between the water molecules, so more energy is needed to move water away from the ions and into the vapor phase.